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<title>module ActiveRecord::ConnectionAdapters::DatabaseStatements - Rails Framework Documentation</title>

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    <li>/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb
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    <li><a href="#method-i-add_transaction_record">#add_transaction_record</a>
    
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    <li><a href="../../ActionController/HttpAuthentication/Basic/ControllerMethods.html">ActionController::HttpAuthentication::Basic::ControllerMethods</a>
  
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    <li><a href="../../ActionView/ActionView.html">ActionView::ActionView</a>
  
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    <li><a href="../../ActionView/Helpers/AssetTagHelper/JavascriptTagHelpers/ClassMethods.html">ActionView::Helpers::AssetTagHelper::JavascriptTagHelpers::ClassMethods</a>
  
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    <li><a href="../../ActionView/Helpers/AssetTagHelper/StylesheetTagHelpers/ClassMethods.html">ActionView::Helpers::AssetTagHelper::StylesheetTagHelpers::ClassMethods</a>
  
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    <li><a href="../../ActionView/Helpers/AtomFeedHelper/AtomFeedBuilder.html">ActionView::Helpers::AtomFeedHelper::AtomFeedBuilder</a>
  
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<div id="documentation">
  <h1 class="module">module ActiveRecord::ConnectionAdapters::DatabaseStatements</h1>

  <div id="description" class="description">
    
  </div><!-- description -->

  
  
  
  <section id="5Buntitled-5D" class="documentation-section">
    

    

    

    

    <!-- Methods -->
    
     <section id="public-instance-5Buntitled-5D-method-details" class="method-section section">
      <h3 class="section-header">Public Instance Methods</h3>

    
      <div id="method-i-add_transaction_record" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">add_transaction_record</span><span
            class="method-args">(record)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Register a record with the current transaction so that its after_commit and
after_rollback callbacks can be called.</p>
          

          
          <div class="method-source-code" id="add_transaction_record-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 242</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">add_transaction_record</span>(<span class="ruby-identifier">record</span>)
  <span class="ruby-identifier">last_batch</span> = <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">last</span>
  <span class="ruby-identifier">last_batch</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">record</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">last_batch</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- add_transaction_record-source -->
          
        </div>

        

        
      </div><!-- add_transaction_record-method -->

    
      <div id="method-i-begin_db_transaction" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">begin_db_transaction</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Begins the transaction (and turns off auto-committing).</p>
          

          
          <div class="method-source-code" id="begin_db_transaction-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 248</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">begin_db_transaction</span>()    <span class="ruby-keyword">end</span></pre>
          </div><!-- begin_db_transaction-source -->
          
        </div>

        

        
      </div><!-- begin_db_transaction-method -->

    
      <div id="method-i-case_sensitive_equality_operator" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">case_sensitive_equality_operator</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="case_sensitive_equality_operator-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 284</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">case_sensitive_equality_operator</span>
  <span class="ruby-string">&quot;=&quot;</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- case_sensitive_equality_operator-source -->
          
        </div>

        

        
      </div><!-- case_sensitive_equality_operator-method -->

    
      <div id="method-i-commit_db_transaction" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">commit_db_transaction</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Commits the transaction (and turns on auto-committing).</p>
          

          
          <div class="method-source-code" id="commit_db_transaction-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 251</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">commit_db_transaction</span>()   <span class="ruby-keyword">end</span></pre>
          </div><!-- commit_db_transaction-source -->
          
        </div>

        

        
      </div><!-- commit_db_transaction-method -->

    
      <div id="method-i-default_sequence_name" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">default_sequence_name</span><span
            class="method-args">(table, column)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="default_sequence_name-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 257</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">default_sequence_name</span>(<span class="ruby-identifier">table</span>, <span class="ruby-identifier">column</span>)
  <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- default_sequence_name-source -->
          
        </div>

        

        
      </div><!-- default_sequence_name-method -->

    
      <div id="method-i-delete" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">delete</span><span
            class="method-args">(arel, name = nil, binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes the delete statement and returns the number of rows affected.</p>
          

          
          <div class="method-source-code" id="delete-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 100</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">delete</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">binds</span> = [])
  <span class="ruby-identifier">exec_delete</span>(<span class="ruby-identifier">to_sql</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">binds</span>), <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- delete-source -->
          
        </div>

        

        
      </div><!-- delete-method -->

    
      <div id="method-i-empty_insert_statement_value" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">empty_insert_statement_value</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="empty_insert_statement_value-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 280</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">empty_insert_statement_value</span>
  <span class="ruby-string">&quot;VALUES(DEFAULT)&quot;</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- empty_insert_statement_value-source -->
          
        </div>

        

        
      </div><!-- empty_insert_statement_value-method -->

    
      <div id="method-i-exec_delete" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">exec_delete</span><span
            class="method-args">(sql, name, binds)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes delete <code>sql</code> statement in the context of this
connection using <code>binds</code> as the bind substitutes.
<code>name</code> is the logged along with the executed <code>sql</code>
statement.</p>
          

          
          <div class="method-source-code" id="exec_delete-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 69</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">exec_delete</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
  <span class="ruby-identifier">exec_query</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- exec_delete-source -->
          
        </div>

        

        
      </div><!-- exec_delete-method -->

    
      <div id="method-i-exec_insert" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">exec_insert</span><span
            class="method-args">(sql, name, binds)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes insert <code>sql</code> statement in the context of this
connection using <code>binds</code> as the bind substitutes.
<code>name</code> is the logged along with the executed <code>sql</code>
statement.</p>
          

          
          <div class="method-source-code" id="exec_insert-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 62</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">exec_insert</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
  <span class="ruby-identifier">exec_query</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- exec_insert-source -->
          
        </div>

        

        
      </div><!-- exec_insert-method -->

    
      <div id="method-i-exec_query" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">exec_query</span><span
            class="method-args">(sql, name = 'SQL', binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes <code>sql</code> statement in the context of this connection using
<code>binds</code> as the bind substitutes. <code>name</code> is logged
along with the executed <code>sql</code> statement.</p>
          

          
          <div class="method-source-code" id="exec_query-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 56</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">exec_query</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-string">'SQL'</span>, <span class="ruby-identifier">binds</span> = [])
<span class="ruby-keyword">end</span></pre>
          </div><!-- exec_query-source -->
          
        </div>

        

        
      </div><!-- exec_query-method -->

    
      <div id="method-i-exec_update" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">exec_update</span><span
            class="method-args">(sql, name, binds)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes update <code>sql</code> statement in the context of this
connection using <code>binds</code> as the bind substitutes.
<code>name</code> is the logged along with the executed <code>sql</code>
statement.</p>
          

          
          <div class="method-source-code" id="exec_update-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 76</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">exec_update</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
  <span class="ruby-identifier">exec_query</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- exec_update-source -->
          
        </div>

        

        
      </div><!-- exec_update-method -->

    
      <div id="method-i-execute" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">execute</span><span
            class="method-args">(sql, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes the SQL statement in the context of this connection.</p>
          

          
          <div class="method-source-code" id="execute-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 49</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">execute</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- execute-source -->
          
        </div>

        

        
      </div><!-- execute-method -->

    
      <div id="method-i-insert" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">insert</span><span
            class="method-args">(arel, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns the last auto-generated ID from the affected table.</p>

<p><code>id_value</code> will be returned unless the value is nil, in which
case the database will attempt to calculate the last inserted id and return
that value.</p>

<p>If the next id was calculated in advance (as in Oracle), it should be
passed in as <code>id_value</code>.</p>
          

          
          <div class="method-source-code" id="insert-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 88</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">insert</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">pk</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">id_value</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">sequence_name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">binds</span> = [])
  <span class="ruby-identifier">sql</span>, <span class="ruby-identifier">binds</span> = <span class="ruby-identifier">sql_for_insert</span>(<span class="ruby-identifier">to_sql</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">binds</span>), <span class="ruby-identifier">pk</span>, <span class="ruby-identifier">id_value</span>, <span class="ruby-identifier">sequence_name</span>, <span class="ruby-identifier">binds</span>)
  <span class="ruby-identifier">value</span>      = <span class="ruby-identifier">exec_insert</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
  <span class="ruby-identifier">id_value</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">last_inserted_id</span>(<span class="ruby-identifier">value</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- insert-source -->
          
        </div>

        

        
      </div><!-- insert-method -->

    
      <div id="method-i-insert_fixture" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">insert_fixture</span><span
            class="method-args">(fixture, table_name)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Inserts the given fixture into the table. Overridden in adapters that
require something beyond a simple insert (eg. Oracle).</p>
          

          
          <div class="method-source-code" id="insert_fixture-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 268</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">insert_fixture</span>(<span class="ruby-identifier">fixture</span>, <span class="ruby-identifier">table_name</span>)
  <span class="ruby-identifier">columns</span> = <span class="ruby-constant">Hash</span>[<span class="ruby-identifier">columns</span>(<span class="ruby-identifier">table_name</span>).<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">c</span><span class="ruby-operator">|</span> [<span class="ruby-identifier">c</span>.<span class="ruby-identifier">name</span>, <span class="ruby-identifier">c</span>] }]

  <span class="ruby-identifier">key_list</span>   = []
  <span class="ruby-identifier">value_list</span> = <span class="ruby-identifier">fixture</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">name</span>, <span class="ruby-identifier">value</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">key_list</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">quote_column_name</span>(<span class="ruby-identifier">name</span>)
    <span class="ruby-identifier">quote</span>(<span class="ruby-identifier">value</span>, <span class="ruby-identifier">columns</span>[<span class="ruby-identifier">name</span>])
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">execute</span> <span class="ruby-node">&quot;INSERT INTO #{quote_table_name(table_name)} (#{key_list.join(', ')}) VALUES (#{value_list.join(', ')})&quot;</span>, <span class="ruby-string">'Fixture Insert'</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- insert_fixture-source -->
          
        </div>

        

        
      </div><!-- insert_fixture-method -->

    
      <div id="method-i-limited_update_conditions" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">limited_update_conditions</span><span
            class="method-args">(where_sql, quoted_table_name, quoted_primary_key)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="limited_update_conditions-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 288</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">limited_update_conditions</span>(<span class="ruby-identifier">where_sql</span>, <span class="ruby-identifier">quoted_table_name</span>, <span class="ruby-identifier">quoted_primary_key</span>)
  <span class="ruby-node">&quot;WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{quoted_table_name} #{where_sql})&quot;</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- limited_update_conditions-source -->
          
        </div>

        

        
      </div><!-- limited_update_conditions-method -->

    
      <div id="method-i-outside_transaction-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">outside_transaction?</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Checks whether there is currently no transaction active. This is done by
querying the database driver, and does not use the transaction
house-keeping information recorded by increment_open_transactions and
friends.</p>

<p>Returns true if there is no transaction active, false if there is a
transaction active, and nil if this information is unknown.</p>

<p>Not all adapters supports transaction state introspection. Currently, only
the PostgreSQL adapter supports this.</p>
          

          
          <div class="method-source-code" id="outside_transaction-3F-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 114</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">outside_transaction?</span>
  <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- outside_transaction-3F-source -->
          
        </div>

        

        
      </div><!-- outside_transaction-3F-method -->

    
      <div id="method-i-reset_sequence-21" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">reset_sequence!</span><span
            class="method-args">(table, column, sequence = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Set the sequence to the max value of the table’s column.</p>
          

          
          <div class="method-source-code" id="reset_sequence-21-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 262</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">reset_sequence!</span>(<span class="ruby-identifier">table</span>, <span class="ruby-identifier">column</span>, <span class="ruby-identifier">sequence</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-comment"># Do nothing by default. Implement for PostgreSQL, Oracle, ...</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- reset_sequence-21-source -->
          
        </div>

        

        
      </div><!-- reset_sequence-21-method -->

    
      <div id="method-i-rollback_db_transaction" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">rollback_db_transaction</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Rolls back the transaction (and turns on auto-committing). Must be done if
the transaction block raises an exception or returns false.</p>
          

          
          <div class="method-source-code" id="rollback_db_transaction-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 255</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">rollback_db_transaction</span>() <span class="ruby-keyword">end</span></pre>
          </div><!-- rollback_db_transaction-source -->
          
        </div>

        

        
      </div><!-- rollback_db_transaction-method -->

    
      <div id="method-i-sanitize_limit" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">sanitize_limit</span><span
            class="method-args">(limit)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Sanitizes the given LIMIT parameter in order to prevent SQL injection.</p>

<p>The <code>limit</code> may be anything that can evaluate to a string via
to_s. It should look like an integer, or a comma-delimited list of
integers, or an Arel SQL literal.</p>

<p>Returns <a href="../../Integer.html">Integer</a> and
Arel::Nodes::SqlLiteral limits as is. Returns the sanitized limit
parameter, either as an integer, or as a string which contains a
comma-delimited list of integers.</p>
          

          
          <div class="method-source-code" id="sanitize_limit-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 301</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">sanitize_limit</span>(<span class="ruby-identifier">limit</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">limit</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Integer</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">limit</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">Arel</span><span class="ruby-operator">::</span><span class="ruby-constant">Nodes</span><span class="ruby-operator">::</span><span class="ruby-constant">SqlLiteral</span>)
    <span class="ruby-identifier">limit</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">limit</span>.<span class="ruby-identifier">to_s</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp">%r,/</span>
    <span class="ruby-constant">Arel</span>.<span class="ruby-identifier">sql</span> <span class="ruby-identifier">limit</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">split</span>(<span class="ruby-string">','</span>).<span class="ruby-identifier">map</span>{ <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-constant">Integer</span>(<span class="ruby-identifier">i</span>) }.<span class="ruby-identifier">join</span>(<span class="ruby-string">','</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-constant">Integer</span>(<span class="ruby-identifier">limit</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- sanitize_limit-source -->
          
        </div>

        

        
      </div><!-- sanitize_limit-method -->

    
      <div id="method-i-select_all" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">select_all</span><span
            class="method-args">(arel, name = nil, binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns an array of record hashes with the column names as keys and column
values as values.</p>
          

          
          <div class="method-source-code" id="select_all-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 17</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">select_all</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">binds</span> = [])
  <span class="ruby-identifier">select</span>(<span class="ruby-identifier">to_sql</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">binds</span>), <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- select_all-source -->
          
        </div>

        

        
      </div><!-- select_all-method -->

    
      <div id="method-i-select_one" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">select_one</span><span
            class="method-args">(arel, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns a record hash with the column names as keys and column values as
values.</p>
          

          
          <div class="method-source-code" id="select_one-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 23</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">select_one</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">result</span> = <span class="ruby-identifier">select_all</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span>)
  <span class="ruby-identifier">result</span>.<span class="ruby-identifier">first</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">result</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- select_one-source -->
          
        </div>

        

        
      </div><!-- select_one-method -->

    
      <div id="method-i-select_rows" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">select_rows</span><span
            class="method-args">(sql, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns an array of arrays containing the field values. Order is the same
as that returned by <code>columns</code>.</p>
          

          
          <div class="method-source-code" id="select_rows-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 44</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">select_rows</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- select_rows-source -->
          
        </div>

        

        
      </div><!-- select_rows-method -->

    
      <div id="method-i-select_value" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">select_value</span><span
            class="method-args">(arel, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns a single value from a record</p>
          

          
          <div class="method-source-code" id="select_value-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 29</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">select_value</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">result</span> = <span class="ruby-identifier">select_one</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span>)
    <span class="ruby-identifier">result</span>.<span class="ruby-identifier">values</span>.<span class="ruby-identifier">first</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- select_value-source -->
          
        </div>

        

        
      </div><!-- select_value-method -->

    
      <div id="method-i-select_values" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">select_values</span><span
            class="method-args">(arel, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns an array of the values of the first column in a select:</p>

<pre class="ruby"><span class="ruby-identifier">select_values</span>(<span class="ruby-string">&quot;SELECT id FROM companies LIMIT 3&quot;</span>) =<span class="ruby-operator">&gt;</span> [<span class="ruby-value">1</span>,<span class="ruby-value">2</span>,<span class="ruby-value">3</span>]
</pre>
          

          
          <div class="method-source-code" id="select_values-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 37</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">select_values</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">result</span> = <span class="ruby-identifier">select_rows</span>(<span class="ruby-identifier">to_sql</span>(<span class="ruby-identifier">arel</span>, []), <span class="ruby-identifier">name</span>)
  <span class="ruby-identifier">result</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-identifier">v</span>[<span class="ruby-value">0</span>] }
<span class="ruby-keyword">end</span></pre>
          </div><!-- select_values-source -->
          
        </div>

        

        
      </div><!-- select_values-method -->

    
      <div id="method-i-supports_statement_cache-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">supports_statement_cache?</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns <code>true</code> when the connection adapter supports prepared
statement caching, otherwise returns <code>false</code></p>
          

          
          <div class="method-source-code" id="supports_statement_cache-3F-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 120</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">supports_statement_cache?</span>
  <span class="ruby-keyword">false</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- supports_statement_cache-3F-source -->
          
        </div>

        

        
      </div><!-- supports_statement_cache-3F-method -->

    
      <div id="method-i-to_sql" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">to_sql</span><span
            class="method-args">(arel, binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Converts an arel AST to SQL</p>
          

          
          <div class="method-source-code" id="to_sql-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 5</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">to_sql</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">binds</span> = [])
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">arel</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:ast</span>)
    <span class="ruby-identifier">visitor</span>.<span class="ruby-identifier">accept</span>(<span class="ruby-identifier">arel</span>.<span class="ruby-identifier">ast</span>) <span class="ruby-keyword">do</span>
      <span class="ruby-identifier">quote</span>(*<span class="ruby-identifier">binds</span>.<span class="ruby-identifier">shift</span>.<span class="ruby-identifier">reverse</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">arel</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- to_sql-source -->
          
        </div>

        

        
      </div><!-- to_sql-method -->

    
      <div id="method-i-transaction" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">transaction</span><span
            class="method-args">(options = {}) { || ... }</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Runs the given block in a database transaction, and returns the result of
the block.</p>

<h2 id="method-i-transaction-label-Nested+transactions+support">Nested transactions support</h2>

<p>Most databases don’t support true nested transactions. At the time of
writing, the only database that supports true nested transactions that
we’re aware of, is MS-SQL.</p>

<p>In order to get around this problem, <a
href="DatabaseStatements.html#method-i-transaction">transaction</a> will
emulate the effect of nested transactions, by using savepoints: <a
href="http://dev.mysql.com/doc/refman/5.0/en/savepoint.html">dev.mysql.com/doc/refman/5.0/en/savepoint.html</a>
Savepoints are supported by MySQL and PostgreSQL, but not SQLite3.</p>

<p>It is safe to call this method if a database transaction is already open,
i.e. if <a
href="DatabaseStatements.html#method-i-transaction">transaction</a> is
called within another <a
href="DatabaseStatements.html#method-i-transaction">transaction</a> block.
In case of a nested call, <a
href="DatabaseStatements.html#method-i-transaction">transaction</a> will
behave as follows:</p>
<ul><li>
<p>The block will be run without doing anything. All database statements that
happen within the block are effectively appended to the already open
database transaction.</p>
</li><li>
<p>However, if <code>:requires_new</code> is set, the block will be wrapped in
a database savepoint acting as a sub-transaction.</p>
</li></ul>

<h3 id="method-i-transaction-label-Caveats">Caveats</h3>

<p>MySQL doesn’t support DDL transactions. If you perform a DDL operation,
then any created savepoints will be automatically released. For example, if
you’ve created a savepoint, then you execute a CREATE TABLE statement, then
the savepoint that was created will be automatically released.</p>

<p>This means that, on MySQL, you shouldn’t execute DDL operations inside a <a
href="DatabaseStatements.html#method-i-transaction">transaction</a> call
that you know might create a savepoint. Otherwise, <a
href="DatabaseStatements.html#method-i-transaction">transaction</a> will
raise exceptions when it tries to release the
already-automatically-released savepoints:</p>

<pre class="ruby"><span class="ruby-constant">Model</span>.<span class="ruby-identifier">connection</span>.<span class="ruby-identifier">transaction</span> <span class="ruby-keyword">do</span>  <span class="ruby-comment"># BEGIN</span>
  <span class="ruby-constant">Model</span>.<span class="ruby-identifier">connection</span>.<span class="ruby-identifier">transaction</span>(:<span class="ruby-identifier">requires_new</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>) <span class="ruby-keyword">do</span>  <span class="ruby-comment"># CREATE SAVEPOINT active_record_1</span>
    <span class="ruby-constant">Model</span>.<span class="ruby-identifier">connection</span>.<span class="ruby-identifier">create_table</span>(<span class="ruby-operator">...</span>)
    <span class="ruby-comment"># active_record_1 now automatically released</span>
  <span class="ruby-keyword">end</span>  <span class="ruby-comment"># RELEASE SAVEPOINT active_record_1  &lt;--- BOOM! database error!</span>
<span class="ruby-keyword">end</span>
</pre>
          

          
          <div class="method-source-code" id="transaction-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 166</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">transaction</span>(<span class="ruby-identifier">options</span> = {})
  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">assert_valid_keys</span> <span class="ruby-value">:requires_new</span>, <span class="ruby-value">:joinable</span>

  <span class="ruby-identifier">last_transaction_joinable</span> = <span class="ruby-keyword">defined?</span>(<span class="ruby-ivar">@transaction_joinable</span>) <span class="ruby-operator">?</span> <span class="ruby-ivar">@transaction_joinable</span> <span class="ruby-operator">:</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>.<span class="ruby-identifier">has_key?</span>(<span class="ruby-value">:joinable</span>)
    <span class="ruby-ivar">@transaction_joinable</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:joinable</span>]
  <span class="ruby-keyword">else</span>
    <span class="ruby-ivar">@transaction_joinable</span> = <span class="ruby-keyword">true</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">requires_new</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:requires_new</span>] <span class="ruby-operator">||</span> <span class="ruby-operator">!</span><span class="ruby-identifier">last_transaction_joinable</span>

  <span class="ruby-identifier">transaction_open</span> = <span class="ruby-keyword">false</span>
  <span class="ruby-ivar">@_current_transaction_records</span> <span class="ruby-operator">||=</span> []

  <span class="ruby-keyword">begin</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">block_given?</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">requires_new</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">open_transactions</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
        <span class="ruby-keyword">if</span> <span class="ruby-identifier">open_transactions</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
          <span class="ruby-identifier">begin_db_transaction</span>
        <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">requires_new</span>
          <span class="ruby-identifier">create_savepoint</span>
        <span class="ruby-keyword">end</span>
        <span class="ruby-identifier">increment_open_transactions</span>
        <span class="ruby-identifier">transaction_open</span> = <span class="ruby-keyword">true</span>
        <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">push</span>([])
      <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">yield</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Exception</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">database_transaction_rollback</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">transaction_open</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-operator">!</span><span class="ruby-identifier">outside_transaction?</span>
      <span class="ruby-identifier">transaction_open</span> = <span class="ruby-keyword">false</span>
      <span class="ruby-identifier">decrement_open_transactions</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">open_transactions</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
        <span class="ruby-identifier">rollback_db_transaction</span>
        <span class="ruby-identifier">rollback_transaction_records</span>(<span class="ruby-keyword">true</span>)
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">rollback_to_savepoint</span>
        <span class="ruby-identifier">rollback_transaction_records</span>(<span class="ruby-keyword">false</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">raise</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">database_transaction_rollback</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">ActiveRecord</span><span class="ruby-operator">::</span><span class="ruby-constant">Rollback</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">ensure</span>
  <span class="ruby-ivar">@transaction_joinable</span> = <span class="ruby-identifier">last_transaction_joinable</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">outside_transaction?</span>
    <span class="ruby-ivar">@open_transactions</span> = <span class="ruby-value">0</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">transaction_open</span>
    <span class="ruby-identifier">decrement_open_transactions</span>
    <span class="ruby-keyword">begin</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">open_transactions</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
        <span class="ruby-identifier">commit_db_transaction</span>
        <span class="ruby-identifier">commit_transaction_records</span>
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">release_savepoint</span>
        <span class="ruby-identifier">save_point_records</span> = <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">pop</span>
        <span class="ruby-keyword">unless</span> <span class="ruby-identifier">save_point_records</span>.<span class="ruby-identifier">blank?</span>
          <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">push</span>([]) <span class="ruby-keyword">if</span> <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">empty?</span>
          <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">last</span>.<span class="ruby-identifier">concat</span>(<span class="ruby-identifier">save_point_records</span>)
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Exception</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">database_transaction_rollback</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">open_transactions</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
        <span class="ruby-identifier">rollback_db_transaction</span>
        <span class="ruby-identifier">rollback_transaction_records</span>(<span class="ruby-keyword">true</span>)
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">rollback_to_savepoint</span>
        <span class="ruby-identifier">rollback_transaction_records</span>(<span class="ruby-keyword">false</span>)
      <span class="ruby-keyword">end</span>
      <span class="ruby-identifier">raise</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- transaction-source -->
          
        </div>

        

        
      </div><!-- transaction-method -->

    
      <div id="method-i-update" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">update</span><span
            class="method-args">(arel, name = nil, binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes the update statement and returns the number of rows affected.</p>
          

          
          <div class="method-source-code" id="update-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 95</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">update</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">binds</span> = [])
  <span class="ruby-identifier">exec_update</span>(<span class="ruby-identifier">to_sql</span>(<span class="ruby-identifier">arel</span>, <span class="ruby-identifier">binds</span>), <span class="ruby-identifier">name</span>, <span class="ruby-identifier">binds</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- update-source -->
          
        </div>

        

        
      </div><!-- update-method -->

    
    </section><!-- public-instance-method-details -->
  
     <section id="protected-instance-5Buntitled-5D-method-details" class="method-section section">
      <h3 class="section-header">Protected Instance Methods</h3>

    
      <div id="method-i-commit_transaction_records" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">commit_transaction_records</span><span
            class="method-args">()</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Send a commit message to all records after they have been committed.</p>
          

          
          <div class="method-source-code" id="commit_transaction_records-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 366</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">commit_transaction_records</span>
  <span class="ruby-identifier">records</span> = <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">flatten</span>
  <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">clear</span>
  <span class="ruby-keyword">unless</span> <span class="ruby-identifier">records</span>.<span class="ruby-identifier">blank?</span>
    <span class="ruby-identifier">records</span>.<span class="ruby-identifier">uniq</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">record</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">begin</span>
        <span class="ruby-identifier">record</span>.<span class="ruby-identifier">committed!</span>
      <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Exception</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">e</span>
        <span class="ruby-identifier">record</span>.<span class="ruby-identifier">logger</span>.<span class="ruby-identifier">error</span>(<span class="ruby-identifier">e</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">record</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:logger</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">record</span>.<span class="ruby-identifier">logger</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- commit_transaction_records-source -->
          
        </div>

        

        
      </div><!-- commit_transaction_records-method -->

    
      <div id="method-i-delete_sql" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">delete_sql</span><span
            class="method-args">(sql, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes the delete statement and returns the number of rows affected.</p>
          

          
          <div class="method-source-code" id="delete_sql-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 340</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">delete_sql</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">update_sql</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- delete_sql-source -->
          
        </div>

        

        
      </div><!-- delete_sql-method -->

    
      <div id="method-i-insert_sql" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">insert_sql</span><span
            class="method-args">(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns the last auto-generated ID from the affected table.</p>
          

          
          <div class="method-source-code" id="insert_sql-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 329</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">insert_sql</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">pk</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">id_value</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">sequence_name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">execute</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>)
  <span class="ruby-identifier">id_value</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- insert_sql-source -->
          
        </div>

        

        
      </div><!-- insert_sql-method -->

    
      <div id="method-i-last_inserted_id" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">last_inserted_id</span><span
            class="method-args">(result)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="last_inserted_id-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 384</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">last_inserted_id</span>(<span class="ruby-identifier">result</span>)
  <span class="ruby-identifier">row</span> = <span class="ruby-identifier">result</span>.<span class="ruby-identifier">rows</span>.<span class="ruby-identifier">first</span>
  <span class="ruby-identifier">row</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">row</span>.<span class="ruby-identifier">first</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- last_inserted_id-source -->
          
        </div>

        

        
      </div><!-- last_inserted_id-method -->

    
      <div id="method-i-rollback_transaction_records" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">rollback_transaction_records</span><span
            class="method-args">(rollback)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Send a rollback message to all records after they have been rolled back. If
rollback is false, only rollback records since the last save point.</p>
          

          
          <div class="method-source-code" id="rollback_transaction_records-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 346</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">rollback_transaction_records</span>(<span class="ruby-identifier">rollback</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">rollback</span>
    <span class="ruby-identifier">records</span> = <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">flatten</span>
    <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">clear</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">records</span> = <span class="ruby-ivar">@_current_transaction_records</span>.<span class="ruby-identifier">pop</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">unless</span> <span class="ruby-identifier">records</span>.<span class="ruby-identifier">blank?</span>
    <span class="ruby-identifier">records</span>.<span class="ruby-identifier">uniq</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">record</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">begin</span>
        <span class="ruby-identifier">record</span>.<span class="ruby-identifier">rolledback!</span>(<span class="ruby-identifier">rollback</span>)
      <span class="ruby-keyword">rescue</span> <span class="ruby-constant">Exception</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">e</span>
        <span class="ruby-identifier">record</span>.<span class="ruby-identifier">logger</span>.<span class="ruby-identifier">error</span>(<span class="ruby-identifier">e</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">record</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:logger</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">record</span>.<span class="ruby-identifier">logger</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- rollback_transaction_records-source -->
          
        </div>

        

        
      </div><!-- rollback_transaction_records-method -->

    
      <div id="method-i-select" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">select</span><span
            class="method-args">(sql, name = nil, binds = [])</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Returns an array of record hashes with the column names as keys and column
values as values.</p>
          

          
          <div class="method-source-code" id="select-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 324</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">select</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">binds</span> = [])
<span class="ruby-keyword">end</span></pre>
          </div><!-- select-source -->
          
        </div>

        

        
      </div><!-- select-method -->

    
      <div id="method-i-sql_for_insert" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">sql_for_insert</span><span
            class="method-args">(sql, pk, id_value, sequence_name, binds)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          
          

          
          <div class="method-source-code" id="sql_for_insert-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 380</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">sql_for_insert</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">pk</span>, <span class="ruby-identifier">id_value</span>, <span class="ruby-identifier">sequence_name</span>, <span class="ruby-identifier">binds</span>)
  [<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">binds</span>]
<span class="ruby-keyword">end</span></pre>
          </div><!-- sql_for_insert-source -->
          
        </div>

        

        
      </div><!-- sql_for_insert-method -->

    
      <div id="method-i-update_sql" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">update_sql</span><span
            class="method-args">(sql, name = nil)</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Executes the update statement and returns the number of rows affected.</p>
          

          
          <div class="method-source-code" id="update_sql-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-3.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb, line 335</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">update_sql</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-identifier">execute</span>(<span class="ruby-identifier">sql</span>, <span class="ruby-identifier">name</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- update_sql-source -->
          
        </div>

        

        
      </div><!-- update_sql-method -->

    
    </section><!-- protected-instance-method-details -->
  
  </section><!-- 5Buntitled-5D -->

</div><!-- documentation -->


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